/**
* Store the value in a transaction- and thread-safe manner. It will only be persisted at the end
* of the transaction but will be visible to the current transaction from this call onwards.
*
* @param value the value to store
*/
public void put(T value) {
// the value is changing
TransactionStorage storage =
(TransactionStorage) AlfrescoTransactionSupport.getResource(txnKey);
if (storage == null) {
// it has not changed before
storage = new TransactionStorage();
AlfrescoTransactionSupport.bindResource(txnKey, storage);
// listen to the transaction
AlfrescoTransactionSupport.bindListener(this);
}
storage.newValue = value;
}
/** Promotes the storage value to the single value, if required */
public void afterCommit() {
TransactionStorage storage =
(TransactionStorage) AlfrescoTransactionSupport.getResource(txnKey);
if (storage != null) {
// the value was overridden
setValue(storage.newValue);
}
}
/** @return Returns the transaction- and thread-safe wrapped instance */
@SuppressWarnings("unchecked")
public T get() {
// an in-transaction value overrides the singleton
TransactionStorage storage =
(TransactionStorage) AlfrescoTransactionSupport.getResource(txnKey);
if (storage != null) {
return (T) storage.newValue;
} else {
return (T) getValue();
}
}
